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From CryptoDox, The Online Encyclopedia on Cryptography and Information Security

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Secure/MIME, or S/MIME, is a version of the MIME protocol that supports encryption of messages. S/MIME is based on RSA's public-key encryption.

S/MIME adds digital signature and ecnryption to Internet MIME messages. S/MIME is described in RFC 1521. Emails uses MIME (Multipurpose Internet Mail Extensions) for forming the message body structure (optional). The MIME format enables emails to include graphics, audio, etc. besides text. But MIME does not provide any encryption/security support. This is where S/MIME comes in. S/MIME defines security services for MIME and is described in PKCS #7.

Breaking S/MIME

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